Advertisements
Advertisements
Question
Why are the ceilings of concert halls curved?
Solution
Generally, the ceilings of concert halls, are curved so that sound after reflection reaches all corners of the hall. Sometimes a curved sound board may be placed behind the stage so that the sound, after reflecting from the soundboard, spreads evenly across the width of the hall.
APPEARS IN
RELATED QUESTIONS
Displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
1) Amplitudes
2) Wavelengths
Define amplitude term in relation to a wave.
Define frequency term in relation to a wave.
The following diagram shows three ways in which the string of an instrument can vibrate.
(a) which of the diagram shows the principal note?
(b) which has the frequency four times that of the first?
(c) what is the ratio of the frequency of the vibration in (i) and (ii)?
Write the approximate value of the speed of sound in water.
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
A sound wavelength of 0.332 m has a time period of 10−3 s. If the time period is decreased to 10−4 s, calculate the wavelength and frequency of the new wave.